Prophy handpiece



FIG. 1 is a perspective view of a prophy handpiece showing our new design;

FIG. 2 is another perspective thereof with broken lines illustrating structural environment forming no part of the claim;

FIG. 3 is side elevation thereof;

FIG. 4 is a front elevation thereof;

FIG. 5 is a rear elevation thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view;

FIG. 8 is a perspective view thereof shown without surface shading;

FIG. 9 is a side elevation thereof;

FIG. 10 is a front elevation thereof;

FIG. 11 is a rear elevation thereof;

FIG. 12 is a top plan view thereof; and,

FIG. 13 is a bottom plan view thereof. 

The ornamental design for a prophy handpiece, as shown and described. 